Portal 2: Peer Review downloadable content

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Peer Review is the FREE first DLC for Portal 2, the year's most brain-bending action-adventure game. Featuring a devious new co-op track that continues the story of Atlas, Peabody and GLaDOS, the DLC also includes both single and multiplayer challenge modes, plus leaderboards so you can compare your portal placement and time scores with the Portal community.

Peer Review is the FREE first DLC for Portal 2, the year's most brain-bending action-adventure game. Featuring a devious new co-op track that continues the story of Atlas, Peabody and GLaDOS, the DLC also includes both single and multiplayer challenge modes, plus leaderboards so you can compare your portal placement and time scores with the Portal community.